RTX 3090 throttles on Qwen i2i in ComfyUI: 600s per image vs 40s on a 5070
NotEnoughVRAM · reddit · 2026-10-01
Reddit user NotEnoughVRAM reports severe GPU throttling when running Qwen image-to-image with ComfyUI's default setup on an RTX 3090 FE — outputs average around 600 seconds, versus reported 40 seconds on a 5070. Oddly, text-to-image on the same card works as intended at under 40 seconds.
The poster suspects a missing optimization step and is asking for help. For anyone running Qwen-based i2i on older cards, the thread may surface useful debugging directions (power limits, VRAM swapping, precision settings).
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